init header components

src/app/browser/header.rs

@@ -1,6 +1,22 @@
+#[path = "header/subject.rs"] mod subject;
+#[path = "header/tray.rs"] mod tray;
+
 use gtk::HeaderBar;
 
 pub fn new() -> HeaderBar
 {
-    return HeaderBar::builder().build();
+    let header = HeaderBar::builder().build();
+
+    // Compose childs
+    header.pack_start(
+        &tray::new()
+    );
+
+    header.set_title_widget(
+        Some(
+            &subject::new()
+        )
+    );
+
+    return header;
 }